Using UnAPI
===========

Evergreen's unAPI support includes access to many
record types. For example, the following URL would fetch
bib 267 in MODS32 along with holdings, volume, copy,
and record attribute information:

https://example.org/opac/extras/unapi?id=tag::U2@bre/267{holdings_xml,acn,acp,mra}&format=mods32

To access the new unAPI features, the unAPI ID should have the
following form:

  * +tag::U2@+
  * followed by class name, which may be
    * +bre+ (bibs)
    * +biblio_record_entry_feed+ (multiple bibs)
    * +acl+ (copy locations)
    * +acn+ (volumes)
    * +acnp+ (call number prefixes)
    * +acns+ (call number suffixes)
    * +acp+ (copies)
    * +acpn+ (copy notes)
    * +aou+ (org units)
    * +ascecm+ (copy stat cat entries)
    * +auri+ (located URIs)
    * +bmp+ (monographic parts)
    * +cbs+ (bib sources)
    * +ccs+ (copy statuses)
    * +circ+ (loan checkout and due dates)
    * +holdings_xml+ (holdings)
    * +mmr+ (metarecords)
    * +mmr_holdings_xml+ (metarecords with holdings)
    * +mmr_mra+ (metarecords with record attributes)
    * +mra+ (record attributes)
    * +sbsum+ (serial basic summaries)
    * +sdist+ (serial distributions)
    * +siss+ (serial issues)
    * +sisum+ (serial index summaries)
    * +sitem+ (serial items)
    * +sssum+ (serial supplement summaries)
    * +sstr+ (serial streams)
    * +ssub+ (serial subscriptions)
    * +sunit+ (serial units)
  * followed by +/+
  * followed by a record identifier (or in the case of
    the +biblio_record_entry_feed+ class, multiple IDs separated
    by commas)
  * followed, optionally, by limit and offset in square brackets
  * followed, optionally, by a comma-separated list of "includes"
    enclosed in curly brackets.  The list of includes is
    the same as the list of classes with the following addition:
    * +bre.extern+ (information from the non-MARC parts of a bib
      record)
   * followed, optionally, by +/+ and org unit; "-" signifies
     the top of the org unit tree
   * followed, optionally, by +/+ and org unit depth
   * followed, optionally, by +/+ and a path. If the path
     is +barcode+ and the class is +acp+, the record ID is taken
     to be a copy barcode rather than a copy ID; for example, in
     +tag::U2@acp/ACQ140{acn,bre,mra}/-/0/barcode+, +ACQ140+ is
     meant to be a copy barcode.
   * followed, optionally, by +&format=+ and the format in which the record
     should be retrieved. If this part is omitted, the list of available
     formats will be retrieved.